CVE-2021-32659 log

Severity Medium
Remote Yes
Type Insufficient validation
In versions 2.6.0 and earlier of matrix-appservice-bridge, as included in matrix-appservice-irc before version 0.27.0, if a bridge has room upgrade handling turned on in the configuration (the `roomUpgradeOpts` key when instantiating a new `Bridge` instance.), any `` event it encounters will be used to unbridge the current room and bridge into the target room. However, the target room `` event is not checked to verify if the `predecessor` field contains the previous room. This means that any malicious admin of a bridged room can repoint the traffic to a different room without the new room being aware. Versions 2.6.1 and greater are patched. As a workaround, disabling the automatic room upgrade handling can be done by removing the `roomUpgradeOpts` key from the `Bridge` class options.
Group Package Affected Fixed Severity Status Ticket
AVG-2076 matrix-appservice-irc 0.26.1-1 0.27.0-1 Medium Fixed
Date Advisory Group Package Severity Type
22 Jun 2021 ASA-202106-51 AVG-2076 matrix-appservice-irc Medium insufficient validation